Polishing-machine.



J. REETZ.

POLISHING MACHINE.

APPLICATION FILED SEPT. 19, 1907,

Patented Apr. 6, 1909.

3 SEEETS-SHEET 1.

1H: mmms PETERS 2:0 WASHINGTON, n c.

J. REETZ.

PoLlsHING MACHINE. APPLIOATION FILED SEPT. 19, 1907.

Patented Apr. 6, 1909.

SSHEETS-SHEBT 2.

1m: mum's PETERS co., wnsnmarou, n. c.

Patented Apr. 6, 1909.

BSHEETB-SHEBT 3.

m: uonms PEIERS Cm, wAsl-mvuron. n. c.

pairs s'rnns PATENT caries.

JOHANN REETZ, OF DUSSELDORF, GERMANY.

POLISHING-TILACHIN E Application filed September 19, 1907.

T all whom it may concern:

Be it known that I, JOi-IANN REETZ, a citizen of Germany, residing atDusseldorf, Germany, have invented new and useful improvements inPolishing-iitfachincs, of which the following is a specification.

This invention relates to a machine for polishing silver or other metalware by means of a polishing tool provided with interchangeable parts,so that it may be used on articles of different configurations.

In the accompanying drawings: Figure 1 is a front view, partly insection, of my improved polishing machine; Fig. 2 a side vi" v, partlybroken away, thereof; Fig. 3 a pl 1; Fig. 4 a detail of the work-holderand cooperating parts Fig. 5 a side view of a modification of themachine; Fig. 6 a detail of the worm-wheel and cooperating parts; 7 asimilar view, showing the parts in different positions Fig. 8 a sideview, partly in section, of a further modification, and Fig. 9 a detailof the polishing tool.

A resilient polishing tool 1 is adapted to be reciprocated horizontallyover the surface of the work-piece while the latter receivessimultaneously a gradual forward or osc llating motion according to itsshape. Tool 1 assumes always a substantial perpendicular position to thework-piece and remains at a uniform distance therefrom, so that an evenpolish is imparted to the latter. As shown, two polishing tools 1 areemployed, by means of which two spoons or other work-pieces may bepolished simultaneously, one being polished at its front, while theother is polished at its back.

On the powenshaft 5, which receives its movement from an electro-motor17, are mounted a pair of disks 4 having radial grooves 6 that receivecrank-pins 3 adjustable within the grooves by set screws 7. Pins 3 areconnected by rods 11, with housings or sliders 8 carrying tools 1, andguided on rods 9 of slides 10. By the means described, a longitudinalreciprocating movement is imparted to tools 1. Slides 10 carry thework-holders 14 and are provided with nuts 13 engaged by spindles 12, sothat by turning the latter, the work-holders may be set to correspond tothe movement of tools 1.

For polishing spoons and similar articles, the work-holders 14 arerotatably supported on slide 10, (Figs. 14). For this purpose holders 14are provided with shafts 16 slidable in the hubs of toothed wheels 31that Specification of Letters Patent.

Patented April 6, 1909.

Serial No. 393,614.

receive rotary motion in manner hereinafter described. hafts 16 are sosecured to holders 14, that upon the rotation of the latter, thework-piece is so set that tools 1 extend vertically to the surface to bepolished. Shaft 16 of each work-holder 14 receives motion frompower-shaft 5 by a toothed wheel 18 fast on said shaft and engaging atoothed wheel 19, loosely mounted on a countershaft 24. To wheel 19 issecured a beveled gear wheel 20 which, by beveled gear wheel 21,transmits movement to a beveled gear wheel 22 also loosely mounted onshaft 24. Wheels 20 and 22 are adapted to be coupled to shaft 24 bymeans of a coupling 23 slidably mounted on said shaft and adapted toengage respectively the serrated hub of wheels 20 or 22. By couplingeither of the wheels 20 and 22 to shaft 24, rotation in one or the otherdi rection will thus be imparted to the shaft. Upon shaft 24 is fixed agear wheel 25 meshing into a gear wheel 26 fast on a wormshaft 27. Thelatter is engaged by a wormwheel 28 which, through gear wheels 29, 30transmits motion to wheel 31 and consequently to shaft 16 of work-holder14.

During the rotation or transverse movement of,the work-piece, polishingtools 1 are longitudinally reciprocated, as hereinabove described. Thestroke of tools 1 may be regulated by adjusting crank-pins 3 in grooves6 of disks 4. In order to cause tools 1 to uniformly act upon thework-piece, slides 10 are provided with pattern-holders 32 mounted onaxles 36. Pattern-holders 32 are provided with levers 37 which, by links38, are connected to levers 37 of workholders 14, so thatpattern-holders 32 participate in the rotary movement of workholders 14.Holders 32 carry, at their lower side, pattern-plates 33, the surface ofwhich corresponds accurately to that of the workpiece, so that tools 1are held with a uniform pressure against the latter. Each axle 36 isjournaled in a bearing 39 slidably mounted in slide 10 and adjustable byscrew 40. By manipulating the latter, the pressure of the polishing toolupon the work-piece may be regulated.

ork-holders 14 are provided with prop erly shaped supports 15 that forma bearing for the spoon and part of the handle. The spoon is held inposition while being polished by means of a clamping lever 41 pivoted tothe work-holder and engaged by an eccentric 42. Supports 15 andpattern-plates 33 are secured to their respective holders in such a waythat they may be readily exchanged.

To arrest the work-holder after a spoon has been polished, worm-wheel 28is provided with stops 43 adapted to engage a shipping-lever 44, which,by means of fork 45, is connected to coupling 23. Simultaneously withthe arrest of the work-holders, polishing tools 1 are arrested bycutting oli the electric current for electro-motor 17. For this purposeshaft 46, to which lever 44 is secured, carries the relatively fixedcontact-lever 47, connected to one pole of the source of electricity andadapted to engage contacts 48 connected to the other pole of saidsource. li hen one of the stops 43 engages lever 44, the latter is swunginto its central position to disengage coupling 23 from wheels 20 and22. Simultaneously with the movement of shipping-lever 44, contact-lever47 has become disengaged from contacts 48, so that the machine comes toa stand-still.

I prefer to so operate the machine that the spoons are first polished ontheir back, (Figs. 1 and 4), and that then the machine is automaticallyarrested as above described. The spoon thus partly polished is nowtransferred to the second work-holder 14 to receive its face polish,(Fig. 2), while another unpolished spoon is secured to the firstworkholder. The machine is now re-started by turning hand-lever 49 ofshaft 46. As lever 44 rests against one of the stops 43 beforehand-lever 49 is operated, the latter can only be turned in onedirection, i. e., away from said stop. In this way coupling 23 engagesthat wheel 20 or 22, which had remained idle during the previousoperation of the machine, so that a proper return motion of the holders14, 32 is insured.

For polishing cups, (Fig. 5), a work-holder 14 is used which is providedwith a support 15 to which the cup is held by tongs 41 engaged by aconical nut 50. /Vorkholders 14 receive a rotary motion, whilepattern-holders 32 remain stationary during the polishing operation. Fordisconnecting holder 32 from holder 14, bolt 51 which was previouslyused for securing lower lever 37 to shaft 15, is withdrawn and insertedinto corresponding holes of bearing 39 and axle 36 to arrest the latter.To maintain coupling 23 in engagement with that one of the wheels 20, 22to which it has been coupled, for continuously rotating the work-piece,stops 43 are withdrawn from worm-wheel 28, so that they will notinfluence shipping-lever 44. For this purpose, steps 43 are carried byanaxially displaccable shaft 52 which may be held in its retractedposition by a suitable latch. 53, (Fig. 7). Upon withdrawing this latch,spring 54 causes the reengagement of stops 43 with worm-wheel 28 to iapart to the work-holder a rocking motion when desired.

For polishing Work-pieces with a plain surface, (Fig. 3),pattern-holders 32 are arrested, as above described, and thepattern-plate 33 is made to correspond to the surface desired. Thework-piece is secured to a laterally slidable table provided with a rack56 engaged by a toothed Wheel 55 secured to shaft 16.

T ie polishing tool is preferably guid ed in a perforated spindle 2,(Fig. 9), and is depressed by a spring 56. A second spring 57 interposedbetween the head of spindle2 and a shoulder of housing 8, tends to holdthe spindle in permanent engagement with pattern-plate I. claim:

1. .In a machine oi the character described, a pattern, a work holderopposite thereto, means for clamping a work-piece to the workholder, aresilient polishing tool intermediate pattern and work-piece, means forrecipro eating the polishing tool, means for uniformly oscillating saidpattern and Workhoider, a coupling operatively connected to saidoscillating means, and means controlled by the last-named means foropening the coupling at each reversal of oscillation, substantially asspecified.

2. In a machine of the character described, a pattern, a work-holderarranged opposite thereto, means for clamping a work-piece to thework-holder, a resilient polishing tool intermediate pattern andWork-piece, a power shalt, means actuated thereby for reciproeating thepolishing tool, a Worm, a coupling operatively connecting theworin tothe power shaft, a Worm wheel engaging said worm, means operated by theWorm wheel for uniformly oscillating said pattern and workholder, andmeans controlledby the Worm wheel for opening the coupling,substantially as specified.

Signeil by me at Berlin, Germany this 9th day of September 1907.

JOHANN REEIZ. Vl itnesses TVVOLDEMAR HAUPT, WILLIAM MAYNER.

